Question

4. How is IST calculated?​

Answer 1

Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+5:30. ... In military and aviation time, IST is designated E* = Echo*. Indian Standard Time is calculated on the basis of 82.5 °E longitude which is just west of the town of Mirzapur, near Allahabad in the state of Uttar Pradesh.